Line breaks without paragraph spacing

I'm trying to enter a post and have line breaks without starting a new paragraph. The help page says I should be able to do this by hitting shift + enter, but this doesn't work for me. I have a Mac and am working in Chrome.
Blog url: http://drmollpersonalhealthandfitness.wordpress.com/

You no longer press shift + enter together. Instead, in html hit enter then type and hit return again. This will give you additional line-breaks. You cannot switch between html and visual as this loses the formatting. I blog poetry - it's taken me 4 months to get this right!